Portable derrick



June 18, 1940- c. WHITE, JR

ronmspn DERRICK s Shee ts Sheet 1 mam 20, 1939 MmSu INVENYDR CARL WH/:TE, JR,

M; ATTORNEY June 18,

c. WHITE. JR 1 2,204,713 PORTABLE nmmrcx Filed "21320.1939 5Sheets-Sheet 2 air fNI ENTOR By CARL WH/TEg/E.

ATTORNEY "Jun is, 1940.

c. w rr, JR PORTABLE DERRI CK Pu-d lay an, 1939 Frames 4 JNVENTQQ 5Shuts-Sheet 3 6142!. WHITE, 2;

c. WHITE, 4

PORTABLE DERRICK Filed llay 20. 1939 5 Sheets-Sheet s [NI/ENTOR 6142/.WHITE, J12

ATTORNEY Patented June 1 8, 1940 "PORTABLE nsaiucx Carl White, in,Tulsa, Okla., assignor to Franks Manufacturing Corporation, Tulsa,

Okla, a

corporation of Oklahoma Application May 20, 1939, Serial No.,2'14,'l45 3Claims., ,(Cl. l8911) This invention relates to a portable derrick mast,for use, particularly, with a portable drilling apparatus. a

The principal object of this invention is to provide a portable derrickstructure comprised of telescoping sections, adapted particularly foruse with portable drilling rigs.

Another object is the provision of a portable derrick structurecomprising a, base section pivotally mounted on a mobile base, an uppersec tion telescopically arranged in said base section, and having anovel form of latching means for locking the upper section in extendedposition on saidbase section. i

Still another object is the provision of 'a telescoping derrickstructure mounted on a mobile base, carrying power operated means forraising and lowering the structure and for extending and retracting thetelescoping sections thereof.

A further object is to provide a portable derrick structure for use withportable drilling rigs,

saidderrick structure being of sufliciently large dimensions requiredfor drilling Jot deep wells but adapted to be telescoped into astructure of reduced dimensions suitable for transporting on a truck.

Anadditional portable derrick structure for portable drilling rigs whichis mounted on a truck and adapted to be easily and quickly raised andlowered as required for operating or transport.

Other important objects and advantages of this invention will be readilyapparentfrom the following detailed description when 'read in conijunction with the accompanying drawings which show a preferredembodiment thereof. In the drawings: a Fig. 1 is a side view of a truckon which is mounted the derrick structure of this invention, I showingin dotted lines the lowermost portion the derrick structure in verticalposition and in full lines the power mechanism for raising and loweringthe structura and the derrick structure in transport position with thesections thereof telescoped together. a i v Fig. 2 is a front view ofthe derrick structure in vertical position showing in full lines thesections telescoped together, and in dotted lines a the extendedposition of the upper section.

Fig. 3 is a side view of a portion of the upper section of the derrickstructure, a r

Fig. 3a is a side view of the lower section of the derrick structure.

Fig. 4 isa schematic view showing the mecha object is the provision of anism for extending and retracting the upper section of the derrickstructure.

Fig. 5 is a perspective view of the latch mechanism for locking thetelescoping derrick section together.

Fig. 6 is a detallof the latch mechanism showing in full lines one ofthe locking pawls in looking position and in dotted lines the positionof the pawl when the derrick sections are released from each other topermit telescoping thereof; and Fig. 7 is a view in perspecti e showingthe outer face of one of the locking pawls.

Referring to the drawings, particularly Fig. l, a motor truck I is shownin side view on which "is mounted the derrick structure of thisinvention, designated generally by the numeral 2. The lowermost portionof the derrick in vertical operating'position is shown in dotted lines,while the entire structure is shown inhorizontal transport position infull lines. The derrick structure is pivotally movable between transportand vertical operatingposition about shaft 3, rotatabiy supportedfromthe truck frame, and is movable thereon by means of-a pitman t, oneend of which is rotatively attached to a, horizontal pivot bar 5,extending between the lowermost extremities of the rear legs 6 of thederrick and the other end journalled in a cross head -'i, whichislongitudinally movable in .the channels of the side member 8 of thetruck frame. The cross head I, is idriven by.means of a power operatedscrew 9, also mounted inthe channel of the side membet 8 and connectedby means of. a chain drive iii to.a power take-01f H operated from thetruck transmission, not shown. IBy driving the cross-head I towardtherear of,the truck frame,

thrust is applied by means of pitman 5} to the pivot bar 5 and rotatesthe derrick 5 about shaft 3, thereby lowering the derrick to thetransport an position shown in full lines in Fig. 1.

The described mech nism for pivotaily moving a truck-mounted derrickbetween transport and vertical operating positions is described ingreater detail in the co-pending application of W. B. Woody, Serial No.194,155, filed March 5, 1938.

The derrick structure of this invention consists ofa base section,designated generally by the numeral l2 and an upper section, designatedgenerally l3, which is adapted to telescope withit!) in the basesection.

1 The base section is composed of rear legs and front legs ll formingthe corner posts of the derrick and constructed of angle-iron, the in,cluded angles of which face inwardly toward 5E "which progressivelydecrease toward the top .of the base section.

Theupper section I3, the upper end of which carries the usual crownblock and pulleys for rigging the lines which support the well pipe anddrilling tools, .is also generally rectangular in horizontalsection,being somewhat smaller in base dimensions than the upper end of basesection I2. Upper section I3 is also composedof angle-iron corner legs,the rear legs being numbered I 8 and the front legs I1, whicharesuitably crossand angle-braced in the same manner as base sectionI2.' I

Rigidly positioned within base section I 2, are, longitudinallyextending front and rear pairs of guide rails I9 and 20, respectively(Figs. 2 and 3),

constructed of angle-iron and forming a hollow rectangular structure ofuniform side dimensions from top to bottom, which are suflicientlygreater than the lower end of upp r section I3 to receive the cornerlegs I1 and I8 thereof in loose fitting sliding engagement within thecorresponding rails I9 and 20. Guide rails I9 and extend longitudinallyfrom the upper end of base section I2 to a point therein just short ofthe lower end of the base section. Thus, when upper section I3 isextended or retracted relative to the base section, it slides inside theguide frame formed by the pairs of guide rails I9 and 20.

The clearance between legs I1 and I8, and rails I9 and 20 is suificientto allow .the former to clear lugs attached to the latter for purposestobe described hereinafter.

Upper section I3 is extended or retractedrel 1 ative to the base sectionI'2 by means of a pulley and cable arrangement illustrated schematicallyinFig, 4, from which guide rails I9 and 20 are removed for purposesofclarity. The arrangement consists of a pulley 2| journalled in oneside of'base section I2 but near the lower end thereof, a second pulley22 journalled in the same side of base section I2 but near the topthereof, and a pair of pulleys 23-23 is positioned on'opposite sides ofthe lower end of upper section I3.- A cable 24 is wound on a winch 25which is driven by a shaft 26 connected by means ofa chain drive 26a tothe power take-off II, and is threaded first through a guide pulley 21,located outside the derrick structure, then, under pulley 2|, overpulley 22, under both'pulleys 2 3-23, and the free end thereof is thenattached to a dead end connection 28 firmly afflxed to the upper end ofbase section I2 on the side opposite pulley 22 Thus, with upper sectionI3 .inthe retracted position within base section I2, by pull applied tocable 24, the upper section is hoisted upwardly within base section I2along guide rails I9 and 20 until the lower end thereof is at thedesired position near the top of base section I2 whereit is locked inplace on lugs 34 by means of a latch mechanism;-

, to be described in detail hereinafter. A When it is rick floor.

anism shown particularly in Figs. 5, 6, and '1, which may be describedas follows:

The lower endlof each of the legs I1 and I9 1: provided with a pawl 30,hingedly attached thereto by a hinge pin 3|, pawl 30 is a hollow,generally angular member, preferablyv of cast steel, provided about itslower edge with a projecting angular shoe 32 which is adapted to bereceived within the angle of the corresponding guide rail I9 or 20. Theshank 33 of each pawl is also angular in shape but has narrower sidesthan the shoe 32. The side dimensions of shank 33 are such as to allowthe shank to fit snugly within the angle of one of the legs I1 or I8.The shank 33 is hingedly attached by means of hinge pin 3| toitscorresponding leg" or I8 so as to swing inwardly towardthe center ofsection I3. When the pawl is snugly in place in the leg angle thelowerend of the corresponding leg will rest upon the upper face of shoe32 which is, in turn, received upon the upper face-0f an angular lug -34which is firmly attached, as by welding, to the inner faces of the sidesof the corresponding corner rail I9 or 20 and thus locks the uppersection I3 against downward movement in base section I 2. 9

The pawls 30 are swung in or out of locking position simultaneously bymeans of toggles 29 each one of which has one end hingedly attached bymeans of a hinge pin 35 to lower end of the corresponding pawl, thetoggle entering in the space between the sides of the pawl and beingheld there by means of the hinge pin 35. The opposite ends of one pairof toggles 29 are pivotally attached to a winged nut 36 and the oppositeends of the other pair of toggles are attached to a winged nut 31. Thewinged nuts 36 and 31 are threadedly attached to the oppositeends of anelongated rod 36, the ends being threaded oppositely to each other sothat when the rod is turned in one direction, the winged nuts 36 and 31will move 'toward the opposite .ends of the rod 33 and so actuate thetoggles to move toward the legs I1 and I 8 and push the attached pawlsinto the locking position. Turning the rod 38 in the reverse directionwill cause thetoggles to ,pull' the pawls out of locking position onlugs 34 and so allow the upper section I3 to clear lugs 34 and permittelescopingthe upper section within base sprocket 42 fixedly mounted onrod 38, .at an intermediate point thereof, to which a chain 43 isconnected. Chain 43 is of suflicient length to reach the floor of thederrick when'the upper section I3 is in position at the top of basesection I2. 2 To pull pawls 30f inwardly of the derrick and out oflocking position between the derrick section, the forward segment ofchain 43 is pulled downwardly by the operator on the der- This operationrotates rod 38 in the clockwise direction causing the wing nuts 36 and31 to be retracted on the threaded ends of the rod. To move the pawls 33outwardly into locking position between the derrick sections, therearward portion of chain 43 is pulled downwardly by the operatorreversing. the previously described movement of rod 33 and nuts 36 and31 with their attached links and pawlsr A secby means of pawls 30 whenthe upper section is retracted within base section I2.

The above described structure isoperated in the following manner: Withthe derrick structure downwardly and forwardly about pivot bar ture inthe horizontal position shown in full lines in Fig. 1, it is desired toraise the structure in preparation for drilling. Power from the truckpower plant is applied through power take-oil. II

to screw 9 to draw cross head I from its rearward position to theforward position shown in dotted lines in Fig. 1. 'Ihismovement actsthrough pitman 4 to pull the lower end of the derrick struc- 3 and thusraise the mast structure to the vertical position. i

,Pawls 30 are then drawn inwardly of upper section l3 to clear lugs 34by downward pull on the forward segment of chain 32 and power. isapplied from power take-oil? ll through drive 26a, and shaft 26 to winch25, to apply pull to cable 24 which then acts through the severalpulleys 21, 2|, 22 and23-23 to lift the upper sec-, tion l3 along guiderails l9--20 to the extended position. When the raising of the uppersection has brought the lower end thereof above the level of lugs 34,the pawls 30 are moved intolocking position between the ends of legs l1and I8 and lugs34 by suitable rotation of rod 33 by downward pull on therear segment of chain 43 and i when the pawls are in position above lugs34, ca-

ble 24 is slackened sufficiently to bring the upper section firmly torest on the lugs 34. The structure is now in position to begin drillingoperations, since it is ordinarily maintained fully rigged with drillinglines, this being possible by virtue of the described construction ofthe derrick structure of this invention, and it is one ofthe importantadvantages thereof in saving time, trouble and expense in the moving andsetting up of derricks of this class.

Y or

To prepare the derrick for transport, upper section 13 is liftedslightly by means of cable 24,

the pawls 30 are withdrawn from the locking position and cable 24slacked to allow the upper section to retract within the base section.When this movement is completed the compacted structure is then returnedto the horizontal transport position by reversing the afore-describedmovement of cross head I and pitman 4.

It will be readily understood that numerous alterations andmodifications may be made in the size, form and arrangement or thedetails :of the structure of this invention, without departing from thescope of the appended claims.

What I cIaim and desire to secure by Letters Patent is:

'1. ,A portable derrick structure comprising a mobile base, a derrickmounted on said base. said derrick comprising a lower section pivotallymounted on said base and movable relative thereto between transport andvertical operating positions, spaced parallel guide rails formed fromangle iron, extending longitudinally within said lower section, an uppersection, formed from angle iron concentrically arranged relativeto-saidrails,

retra ctablewithin said lower section and slidable therein on said guiderails, releasable latching means carried by said upper sectionand'adapted to cooperate with stop means mountedbn said" guide rails forlocking the upper section in extended position to said lower section,said latching means comprising pawl members hingedly attached to thelower endof said upper section and adapted to be swung into and out ofengagement with said stop means, each of said pawls having an angularshank portion and a base in the form of an angular shoe, the shankportion and shoe portion being adapted to seat within the angles of thelegs of the upper derrick section mobile base, a derrick mounted on saidbase comprising a lower section pivotally mounted on said base andmovable relative thereto between transport and vertical operatingpositions, a guide frame extending longitudinally of said lower sectionand comprising four angle-iron rails arranged at the corners of arectangle and having .their included angles turned inwardly toward thelongitudinal axis of said frame, an upper derrick section retractable insaid lower section within said guide frame, said upper section beingcomposed of four angle-ironcorner legs concentrically arranged relativeto said rails, a pair of lugs arranged within the angles of each of saidrails, a pawl hingedly attached to the lower end of each of said cornerlegs, and adapted to be swung into and out of engagement with said lugs,said pawls having an angular shank portion and a base in the form of anangular shoe, the shank portion and the base portion being adapted toseat within the angles of the legs of the upper derrick section and theguide rails respectively, when 'the pawls are swung into engagementwithpawls into and out of engagement withsaid lugs, means for extending andretracting said upper sectionrelative to said lower section, and poweroperated means carried by said mobilebase for actuating said extendingand retracting means and for moving said derrick between transport andvertical operating positions relative to said base. 1,

3. A portable derrick structure comprising a mobile base, a derrickmounted on said base, said derrick comprising a lower section pivotallymounted onsaid base and movable relative thereto between transport andvertical operating'positions, spaced parallel guide rails, formed fromangle iron, extending longitudinally within said lower section, an uppersection, formed from angle iron concentrically arranged relative tosaidrai'ls, retractable within said lower section and slidable thereinon the guide rails, releasable latching means carried by said uppersection and adapted to cooperate'with stop means mounted on said guiderails for locking the upper section in extended position with respect tothe lower section, said latching means comprising pawl ,members.hingedly attached to the lower end of said upper section and adapted tobe 'swung into andoutof engagement with said stop means, each of saidpawls comprising anupper angular shank portion and an enlarged baseportion, said base portion being adapted to fit snugly within the angleof a guide rail between the stop means and the end of one of the legs ofthe upper derrick section, when the pawls are swung into engagement withthe stops, means for positively moving said pawl members into and out ofengagement with the stop members, means for extending and retractingsaid upper section CARL WHITE, JR.

